Question

Burning or combustion leads to increase of the level of ______in the atmosphere.
Oxygen
Carbon dioxide
Ozone
Nitrogen​

Answer 1

Answer:

Oxygen

Explanation:

The men wear oxygen helmets so that they do not introduce modern germs into the ancient air. When the men visit the past with Time Safari, Inc., they have to be very careful not to affect the environment in any way.

Answer 2

Explanation:

carbon dioxide is the answer thanku hope it will help you